diff --git a/rootfs/etc/confd/templates/config.yaml.tmpl b/rootfs/etc/confd/templates/config.yaml.tmpl
index e69dc1a..f08704d 100644
--- a/rootfs/etc/confd/templates/config.yaml.tmpl
+++ b/rootfs/etc/confd/templates/config.yaml.tmpl
@@ -26,7 +26,7 @@ homeserver:
 # Changing these values requires regeneration of the registration.
 appservice:
     # The address that the homeserver can use to connect to this appservice.
-    address: http://localhost:29317
+    address: http://{{getenv "HOSTNAME"}}:29317
     # When using https:// the TLS certificate and key files for the address.
     tls_cert: false
     tls_key: false